工厂创建TEE_SDK模式空指针

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创建的lib_tee_sdk_svm_load.signed的临时文件是个空文件，导致文件流空指针异常，无法创建TEE_SDK的实例。请问如何解决？

Start by reproducing TEE_SDK instance creation and tracing how the temporary lib_tee_sdk_svm_load.signed file is created and consumed. Check where the empty file leads to the file-stream null-pointer failure; done means the cause is identified and instance creation no longer fails for this case, with a regression test if the repository has a relevant test entry point.

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